2 files changed, 21 insertions, 39 deletions

diff --git a/cmd/gint/main.go b/cmd/gint/main.go
index 15a79b0..3ddddc8 100644
--- a/cmd/gint/main.go
+++ b/cmd/gint/main.go
@@ -10,45 +10,22 @@ import (
 	"github.com/gnolang/parscan/vm0"
 )
 
+type Interpreter interface {
+	Eval(string) error
+}
+
 func main() {
 	log.SetFlags(log.Lshortfile)
 	buf, err := os.ReadFile("/dev/stdin")
 	if err != nil {
 		log.Fatal(err)
 	}
-	run := run0
-	if len(os.Args) > 1 {
-		v := "vm" + os.Args[1]
-		switch v {
-		case "vm0":
-		case "vm1":
-			run = run1
-		default:
-			log.Fatal("invalid argument", os.Args[1])
-		}
+	var interp Interpreter = vm0.New(golang.GoParser)
+	if len(os.Args) > 1 && os.Args[1] == "1" {
+		interp = codegen.NewInterpreter(golang.GoParser)
+		interp.(*codegen.Interpreter).AddSym(fmt.Println, "println", false)
 	}
-	if err := run(string(buf)); err != nil {
+	if err := interp.Eval(string(buf)); err != nil {
 		log.Fatal(err)
 	}
 }
-
-func run0(src string) error {
-	i := vm0.New(golang.GoParser)
-	nodes, err := i.Parse(src)
-	if err != nil {
-		return err
-	}
-	i.Adot(nodes, os.Getenv("DOT"))
-	for _, n := range nodes {
-		if _, err := i.Run(n, ""); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-func run1(src string) (err error) {
-	i := codegen.NewInterpreter(golang.GoParser)
-	i.AddSym(fmt.Println, "println", false)
-	return i.Eval(src)
-}
diff --git a/vm0/vm.go b/vm0/vm.go
index 3e589ed..8d0b49e 100644
--- a/vm0/vm.go
+++ b/vm0/vm.go
@@ -2,11 +2,14 @@ package vm0
 
 import (
 	"fmt"
+	"os"
 	"strings"
 
 	"github.com/gnolang/parscan/parser"
 )
 
+const debug = true
+
 type Interp struct {
 	*parser.Parser
 	stack []any          // stack memory space
@@ -20,14 +23,16 @@ func New(p *parser.Parser) (i *Interp) {
 	return i
 }
 
-func (i *Interp) Eval(src string) (r []any, err error) {
-	n, err := i.Parse(src)
-	if err != nil {
-		return nil, err
+func (i *Interp) Eval(src string) (err error) {
+	n := &parser.Node{}
+	if n.Child, err = i.Parse(src); err != nil {
+		return
+	}
+	if debug {
+		n.Dot(os.Getenv("DOT"), "")
 	}
-	for _, nod := range n {
-		r, err = i.Run(nod, "")
-		if err != nil {
+	for _, nod := range n.Child {
+		if _, err = i.Run(nod, ""); err != nil {
 			break
 		}
 	}